I'm not sure about an engine swap.
I'd pull the engine and give it a good rebuild, port the head and intake, weld a custom header for it.
Cronicus can probably give you a ton of pointers.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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